This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
That will almost work. I say almost because, although subclass1 IS-A superclassA, the same cannot be said of List<subclass1> and List<superclassA>. But fortunately, wildcards can help you out:
And you should consider using a for-each loop if you don't need the Iterator inside the loop: